Pass through request parameters in API action=edit

In addition to constructing a fake request using the data the caller
gave us, also pass through any other request variables that might have
been set. This is a bit of an evil hack, but it's the only thing we can
do to make random things like wpReviewEdit in FlaggedRevs work through
the API.

Change-Id: Idab5b524b0e3daae58ab4f26466c0f6d9d8d3044